Roeth A.O.Najoan, Dwi Andriani Pamase and Mozes Yustus Legi 2026. Implementation of the Problem-Based Learning (PBL) Model to Improve Mathematics Learning Outcomes of Third-Grade Students . ARMADA : Jurnal Penelitian Multidisiplin. 4, 6 (Jun. 2026), 1311–1316. DOI:https://doi.org/10.55681/armada.v4i6.2255.